87 gas vs 93

Discussion in 'General Industry Discussions' started by tb8100, Feb 28, 2008.

  1. tb8100

    tb8100 LawnSite Bronze Member
    from TX
    Messages: 1,625

    Does octane really affect fuel economy? I know alot of experienced guys running 93 and alot of experienced guys that won't. The more the octane the more complete the combustion? Someone educate me, please! :dancing:
  2. Frue

    Frue LawnSite Bronze Member
    Messages: 1,472

    10 years in the bus I only use 87
  3. RGM

    RGM LawnSite Senior Member
    Male, from Baltimore Md
    Messages: 979

    I use 87 in my mowers and 93 in the 2 strokes
  4. KarambaStar

    KarambaStar LawnSite Member
    Messages: 76

    More important is watching the alcohol content.
  5. Frontstreetlawns

    Frontstreetlawns LawnSite Member
    Messages: 168

    93 adds life to your equip. well known fact. you get your money back on less maint.
  6. All_Toro_4ME

    All_Toro_4ME LawnSite Bronze Member
    Messages: 1,578

    I use 87 in 4 cycle stuff and 93 in 2 cycle stuff. Higher octane requires less internal temp for combusiton of fuel.
  7. TSG

    TSG LawnSite Senior Member
    Messages: 444

    Run the lowest octane possible.
    Just high enough to avoid "Ping".
    Any higher is a waste.
    High octane in low compression engine = waste of money and can lower
    Higher octane has a higher combustion temp.

    just .02
  8. JimQ

    JimQ LawnSite Bronze Member
    Messages: 1,139

    Holy Cow. This is going to be a good one! :laugh:

  9. DBL

    DBL LawnSite Silver Member
    Messages: 2,219

    thats how we run it
  10. cgaengineer

    cgaengineer LawnSite Fanatic
    Messages: 15,778

    This is true...it actually takes more heat to combust 93. The reason for a higher octane fuel is for higher compression engines, turbocharged engines or supercharged engines. It is a waste to run anything more then you need too, and it does not result in a cleaner engine or more power, it actually makes less power. Octane is a combustion inhibitor not an excellerant.

    Here is something I pulled up to back my claim:

    And for those of you interested in octane boosters. I have owned both a turbocharged car and a supercharged truck and both would detonate running on 87 with an octane booster, the detonation would go away when run on 93.

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